- Experts complete site evaluations
- 500 MW HVDC link planned from Madurai to Mannar
The much-anticipated electricity grid connectivity project between Sri Lanka and India is progressing steadily, with the State-run Ceylon Electricity Board (CEB) set to make key policy decisions following the submission of the joint technical committee’s feasibility report.
According to CEB Chairman and Energy Ministry Secretary Prof. Udayanga Hemapala, technical experts from both countries have completed site visits and thorough evaluations, with the Government now awaiting the detailed findings.
As highlighted in the latest Long-Term Generation Expansion Plan (LTGEP) 2025-2044 issued by the CEB, the interconnection project has a long history of collaborative studies and planning.
The concept originated in 2002 with a pre-feasibility study by Nexant, supported by the United States Agency for International Development (USAID).
This was followed by an updated review by India’s PowerGrid in 2006 and a Memorandum of Understanding (MOU) signed by both Governments in 2010 to conduct an in-depth feasibility study.
Joint efforts by the CEB and India’s Power Grid Corporation have since analysed multiple technical, economic, and regulatory aspects, considering various route options including overhead lines and undersea cables.
The Asian Development Bank (ADB) also funded an economic and financial feasibility assessment to support the project.
While both synchronous and asynchronous grid interconnections were initially considered, the fourth Joint Working Group meeting had favoured an HVDC link for its controlled power flow and enhanced system stability.
The finalised plan includes a ±320 kV, 2x500 MW HVDC link using Voltage Source Converter (VSC) technology, running from Madurai to Mannar. The technology also provides dynamic reactive power support, critical for integrating renewable energy sources and maintaining grid stability.
In 2023, a significant decision was made to shift the HVDC termination point on the Sri Lankan side from New Habarana to Mannar, recognising the additional benefits of harnessing wind energy resources in the Mannar region. This change also prompted further analysis of undersea cable options due to the complexities of operating and maintaining overhead lines over the sea.
The project will be implemented in two phases, with the first phase targeting 500 MW capacity at an estimated cost of $ 1,225 million. This phase will use undersea cables designed to eventually support up to 1,000 MW.
The second phase, which will add a further 500 MW capacity, is planned based on future demand for power exchange between the two countries, as stated in the LTGEP.